Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a104f4b0c53f8ba5c3489a0c3e4a83fa691f6b307789b348fc54b29443573d6f' 
  AND token = '4icohHvTOpMdtlLkYLv8o5cJV5Wv+H6En3fR3+YMa+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}